Rollie Pemberton was barely a teenager when he started rapping. His hometown, Edmonton, didn’t have much of a hip-hop scene in the early aughts, so he honed his craft online. He plugged an old-school microphone into his mom’s desktop computer, recorded a few verses, later turned them into tracks, and sent them out into the burgeoning music blogosphere. Within a few years, he’d adopted the emcee name Cadence Weapon and earned a reputation as a shrewd critic and sharp lyricist. This work didn’t pa...